US10418591B2 - Light emitting device - Google Patents

Light emitting device Download PDF

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Publication number
US10418591B2
US10418591B2 US15/623,624 US201715623624A US10418591B2 US 10418591 B2 US10418591 B2 US 10418591B2 US 201715623624 A US201715623624 A US 201715623624A US 10418591 B2 US10418591 B2 US 10418591B2
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Prior art keywords
substrate
light emitting
organic material
emitting device
light
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Expired - Fee Related
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US15/623,624
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US20170373278A1 (en
Inventor
Tomoaki Harada
Masaya Shido
Yoshiro Ito
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Koito Manufacturing Co Ltd
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Koito Manufacturing Co Ltd
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Assigned to KOITO MANUFACTURING CO., LTD. reassignment KOITO MANUFACTURING CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HARADA, TOMOAKI, ITO, YOSHIRO, SHIDO, MASAYA
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/82—Cathodes
    • H01L51/5265—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F21S43/145—Surface emitters, e.g. organic light emitting diodes [OLED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/19—Attachment of light sources or lamp holders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/31—Optical layout thereof
    • F21S43/315—Optical layout thereof using total internal reflection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/33—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors characterised by their material, surface treatment or coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/08—Devices for easy attachment to any desired place, e.g. clip, clamp, magnet
    • F21V21/0808—Adhesive means
    • H01L51/0096—
    • H01L51/5206—
    • H01L51/5221—
    • H01L51/5225—
    • H01L51/524—
    • H01L51/5271—
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/81—Anodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/82—Cathodes
    • H10K50/822—Cathodes characterised by their shape
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/841—Self-supporting sealing arrangements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/842—Containers
    • H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/852—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/856—Arrangements for extracting light from the devices comprising reflective means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10—Substrates, e.g. flexible substrates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

Definitions

  • the present disclosure relates to a light emitting device using an organic electroluminescence (EL).
  • EL organic electroluminescence
  • the organic EL panel When disposing the organic EL panel inside the rear window, it is required to irradiate the light only to the front side (that is, the rear window side) of the organic EL panel in order to prevent light emitted in the organic EL panel from becoming glare light and dazzling the driver. Also, in order to suppress rearward visibility from deteriorating due to the presence of the organic EL panel, it is required to configure the organic EL panel so that the rear side can be seen through. For these purposes, it has been proposed to configure an organic EL panel to have a light transmission property by forming cathodes in the form of stripes (see, e.g., Japanese Patent Laid-open Publication No. 2015-195173).
  • the present disclosure is made in consideration of such a circumstance, and provides a technology capable of suppressing, in a light emitting device using an organic EL having a light transmission property, light reflected from the surface of the organic EL panel from leaking to the rear side.
  • a light emitting device of one embodiment of the present disclosure is a light emitting device disposed along a transparent member, the light emitting device including: an organic EL panel having a translucent substrate disposed to face the transparent member, a translucent anode disposed on the substrate, an organic material layer disposed on the anode, and a non-translucent cathode disposed on the organic material layer.
  • the organic material layer and the cathode are formed in a form of stripes, and the anode is formed wider than the organic material layer.
  • a width L N of the portion wider than the organic material layer in the cathode may be defined as L N ⁇ 2 d tan(arc sin(1/n 1 )).
  • This device is a light emitting device disposed along a transparent member, the light emitting device including: an organic EL panel having a translucent substrate disposed to face the transparent member, a translucent anode disposed on the substrate, an organic material layer disposed on the anode, a non-translucent cathode disposed on the organic material layer, a sealing member that covers the organic material layer and the cathode, and a light shielding film formed on the sealing member.
  • the organic material layer, the cathode, and the light shielding film are formed in a form of stripes, and the light shielding film is formed wider than the organic material layer.
  • a width L F of the portion wider than the organic material layer in the light shielding film may be defined as L F ⁇ 2 d tan(arc sin(1/n 1 ))+D tan(arc sin(1/n 1 )).
  • An attachment structure may be provided for attaching the organic EL panel to the transparent member so that a layer of materials having a lower reflective index than that of the substrate is formed between the transparent member and the substrate.
  • the organic EL panel may have a microcavity structure in which a half mirror, an anode, an organic material layer, and a cathode are laminated in this order on the substrate.
  • the light reflected on the surface of the organic EL panel may be kept from leaking to the rear side.
  • FIG. 1 is a schematic cross-sectional view of a light emitting device according to an exemplary embodiment of the present disclosure.
  • FIG. 2 is a view for explaining a method of setting the width of a cathode.
  • FIG. 3 is a view illustrating a relationship between the thickness of a substrate and the width of the wide portion of the cathode.
  • FIG. 4 is a schematic cross-sectional view of a light emitting device according to another exemplary embodiment of the present disclosure.
  • FIG. 5 is a view for explaining a method of setting the width of a light shielding film.
  • FIG. 6 is a view illustrating a relationship between the thickness of a substrate and the width of the wide portion of the light shielding film.
  • FIG. 7 is a view illustrating a relationship between the thickness of a sealing member and the width of the wide portion of the light shielding film.
  • FIG. 8 is a schematic cross-sectional view of a light emitting device according to still another exemplary embodiment of the present disclosure.
  • FIGS. 9A and 9B are views for explaining a modified example of the light emitting device.
  • FIG. 1 is a schematic cross-sectional view of a light emitting device 10 according to an exemplary embodiment of the present disclosure.
  • the light emitting device 10 illustrated in FIG. 1 may be used as a vehicular lamp such as, for example, a high mount stop lamp or a tail lamp.
  • the light emitting device 10 is disposed along a transparent member 100 such as, for example, a rear window of a vehicle.
  • the transparent member 100 has a first surface 100 a to which the light emitting device 10 is attached and a second surface 100 b that is opposite the first surface 100 a .
  • the first surface 100 a is the inner surface of the rear window and the second surface 100 b is the outer surface of the rear window.
  • the light emitting device 10 includes an organic EL panel 12 and a double-sided tape 11 as an attachment structure for attaching the organic EL panel 12 to the transparent member 100 .
  • the organic EL panel 12 includes a translucent substrate 23 disposed to face the transparent member 100 , a translucent anode 21 disposed on the substrate 23 , organic material layers 24 disposed on the anode 21 , non-translucent cathodes 26 disposed on the organic material layer 24 , an anode 21 , and a sealing member 28 that covers the organic material layers 24 and the cathodes 26 .
  • the sealing member 28 may be, for example, silicon oxide.
  • the organic EL panel 12 is attached to the first surface 100 a of the transparent member 100 by the double-sided tape 11 attached along the peripheral edge of the substrate 23 . Due to the thickness of the double-sided tape 11 , an air layer 30 is formed between the substrate 23 and the transparent member 100 .
  • anode 21 a transparent electrode formed of indium tin oxide (ITO) or the like is used.
  • cathodes 26 a non-translucent metal electrode formed of aluminum or the like is used.
  • the light directed to the anode 21 passes through the anode 21 and is emitted from a light emitting surface 23 a of the substrate 23 .
  • the light directed to the cathodes 26 is reflected from the cathodes 26 , passes through the organic material layer 24 and the cathodes 26 , and is emitted from the light emitting surface 23 a of the substrate 23 .
  • the organic EL panel 12 basically emits light only to one side direction (referred to as “forward”).
  • the light emitted from the light emitting surface 23 a of the substrate 23 passes through the air layer 30 , is incident on the transparent member 100 from the first surface 100 a , and is emitted from the second surface 100 b.
  • the organic material layers 24 and the cathodes 26 are formed in the form of stripes. That is, a plurality of columnar organic material layers 24 and cathodes 26 are arranged side by side at a predetermined interval.
  • the interior of the light emitting device 10 may be seen through the regions where the organic material layers 24 and the cathodes 26 are not formed.
  • rearward visibility from a driver's seat may be ensured.
  • the cathodes 26 are formed wider than the organic material layers 24 . That is, an end portion of each cathode 26 extends greater than an end portion of each organic material layer 24 in a width direction.
  • An insulating layer 25 is formed between the anode 21 and a portion wider than each organic material layer 24 in each cathode 26 . That is, insulating layers 25 are formed on opposite sides of an organic material layer 24 , and a cathode 26 is provided on the organic material layer 24 and the insulating layers 25 .
  • the insulating layer 25 may be formed of, for example, Ca(DPM) 2 .
  • a part of the light emitted in the organic material layers 24 is reflected from the light emitting surface 23 a of the substrate 23 .
  • Reflected light having a small incident angle to the light emitting surface 23 a is shielded by a cathode 26 .
  • reflected light having a large incident angle passes through a region between every two adjacent columnar cathodes 26 without being shielded by the cathodes 26 , and thus, may leak to the rear side of the organic EL panel 12 .
  • the cathodes 26 are formed to be wider than the organic material layers 24 as described above, the reflected light having a large reflection angle at the light emitting surface 23 a is shielded by the wide portions of the cathodes 26 . As a result, the reflected light at the light emitting surface 23 a of the substrate 23 may be prevented or at least suppressed from leaking to the rear side of the organic EL panel 12 .
  • the light emitting device 10 is disposed along the rear window of the vehicle, the light emitted by the light emitting device 10 of the vehicle is hardly directed toward the driver's seat so that dazzling the driver may be prevented.
  • FIG. 2 is a view for explaining a method of setting the width of a cathode 26 .
  • the minimum required width of the cathode 26 is considered. Also, illustration of the anode is omitted for simplicity in FIG. 2 .
  • the light reflected from the light emitting surface 23 a of the substrate 23 may be prevented from leaking to the rear side by setting the width L N of the wide portion of the cathode 26 to satisfy expression (4).
  • FIG. 3 is a view illustrating a relationship between the thickness d of the substrate 23 and the width L N of the wide portion of the cathode 26 .
  • FIG. 4 is a schematic cross-sectional view of a light emitting device 40 according to another exemplary embodiment of the present disclosure.
  • a light emitting device 100 illustrated in FIG. 4 is also disposed along a transparent member 100 , such as the rear window of a vehicle, and may be used as a vehicular lamp, such as, for example, a high mount stop lamp or a tail lamp.
  • the light emitting device 40 includes an organic EL panel 12 and a double-sided tape 11 as an attachment structure in which the organic EL panel 12 is attached to the transparent member 100 . Due to the thickness of the double-sided tape 11 , an air layer 30 is formed between a substrate 23 and the transparent member 100 .
  • the organic EL panel includes a translucent substrate 23 disposed to face a transparent member 100 , a translucent anode 21 disposed on the substrate 23 , organic material layers 24 disposed on the anode 21 , non-translucent cathodes 26 disposed on the organic material layers 24 , a sealing member 28 that covers the anode 21 , the organic material layers 24 , and the cathode 26 , and light shielding films 42 formed on the sealing member 28 .
  • the light shielding films 42 may be formed of, for example, an adhesive sheet on which Al is deposited.
  • the organic material layers 24 , the cathodes 26 , and the light shielding films 42 are formed in the form of stripes. That is, a plurality of columnar organic material layers 24 and cathodes 26 are arranged side by side at a predetermined interval, and a columnar light shielding film 42 is formed with the sealing member 28 interposed above each columnar organic material layer 24 and each cathode 26 .
  • the interior of the light emitting device 40 can be seen through the regions where the organic material layers 24 , the cathodes 26 , and the light shielding films 42 are not formed. As a result, when the light emitting device 40 is disposed along the rear window of the vehicle, the rearward visibility from the driver's seat may be ensured.
  • the cathodes 26 are formed to have the same width as the organic material layers 24 .
  • the light shielding films 42 are formed wider than the organic material layers 24 . That is, an end portion of each light shielding film 42 extends greater than the end portion of each organic material layer 24 in a width direction.
  • a part of the light emitted in the organic material layers 24 is reflected from the light emitting surface 23 a of the substrate 23 .
  • Reflected light having a small incident angle to the light emitting surface 23 a is shielded by the cathodes 26 .
  • reflected light having a large incident angle is not shielded by the cathodes 26 and passes through the regions between the columnar cathodes 26 , and thus, may leak to the rear side of the organic EL panel 12 .
  • the reflected light having a large incident angle at the light emitting surface 23 a may be shielded by the wide portions of the light shielding films 42 by providing the light shielding films 42 in the form of stripes on the sealing member 28 and forming the light shielding films 42 to be wider than the organic material layers 24 .
  • the light reflected at the light emitting surface 23 a of the substrate 23 may be prevented or at least suppressed from leaking to the rear side of the organic EL panel 12 .
  • FIG. 5 is a view for explaining a method of setting the width of a light shielding film 42 .
  • the minimum required width of the light shielding film 42 is considered. Also, illustration of the anode is omitted for simplicity in FIG. 5 .
  • the light reflected from the light emitting surface 23 a of the substrate 23 may be prevented from leaking to the rear side by setting the width LF of the wide portion of the light shielding film 42 to satisfy expression (7).
  • FIG. 6 is a view illustrating a relationship between the thickness d of the substrate 23 and the width L F of the wide portion of the light shielding film 42 .
  • D the thickness of the sealing member 28
  • FIG. 7 is a view illustrating a relationship between the thickness D of the sealing member 28 and the width L F of the wide portion of the light shielding film 42 .
  • the thickness D of the sealing member 28 is 0.05 mm to 1.0 mm, it is necessary to set the width L F of the wide portion of the light shielding film 42 to 0.22 mm to 1.1 mm or more.
  • FIG. 8 is a schematic cross-sectional view of a light emitting device 80 according to still another exemplary embodiment of the present disclosure.
  • the light emitting device 80 illustrated in FIG. 8 is also disposed along a transparent member 100 , such as a rear window of a vehicle, and may be used as a vehicular lamp such as, for example a high mount stop lamp or a tail lamp.
  • the light emitting device 80 includes an organic EL panel 12 and a transparent frame 82 as an attachment structure that attaches the organic EL panel 12 to the transparent member 100 .
  • the transparent frame 82 is a rectangular frame having a bottom made of a transparent resin, and a sealing member 28 of the organic EL panel 12 is attached to the bottom surface 82 a of the transparent frame 82 .
  • the transparent frame 82 includes support portions 82 b, and when the support portions 82 b are attached to a first surface 100 a of the transparent frame 100 , the organic EL panel 12 is fixed.
  • the support portions 82 b of the transparent frame 82 are formed such that the substrate 23 of the organic EL panel 12 and the transparent member 100 are spaced apart from each other at a predetermined distance. As a result, an air layer 30 is formed between the substrate 23 and the transparent member 100 .
  • the air layer 30 is formed between the substrate 23 of the organic EL panel 12 and the transparent member 100 .
  • the air layer is not formed between the substrate 23 of the organic EL panel 12 and the transparent member 100 , and for example, a tape having a similar refractive index to that of the substrate 23 and that of the transparent member 100 is placed between the substrate 23 and the transparent member 100 , the light reflected at the light emitting surface 23 a of the substrate 23 or the first surface 100 a of the transparent member 100 decreases, but there is a possibility that the light reflected at the second surface 100 b of the transparent member 100 passes through the cathodes 26 in the form of stripes and leaks to the rear side.
  • the air layer 30 is intentionally formed between the substrate 23 of the organic EL panel 12 and the transparent member 100 so as to make the light reflected at the first surface 100 a of the transparent member 100 hardly leak to the rear side.
  • the thickness of the air layer 30 may be about 50 ⁇ m to 10 cm. According to a simulation performed by the present inventors, when the thickness of the air layer 30 is 50 ⁇ m or less, the light leaking backward tends to increase. Further, in consideration of mounting the light emitting device on the vehicle, it is not realistic to form the thickness of the air layer 30 too large, and it is preferable to set the thickness to 10 cm or less.
  • the light reflected at the light emitting surface 23 a of the substrate 23 is shielded by the cathodes 26 or the light shielding films 42 as described above, the light hardly leaks to the rear side.
  • any layer may be formed without being limited to the air layer as long as the layer has a refractive index lower than that of the substrate 23 .
  • FIGS. 9A and 9B are views for explaining a modified example of a light emitting device.
  • FIG. 9A illustrates the light emitting device 10 explained in FIG. 1 .
  • FIG. 9B illustrates a light emitting device 90 according to the modified example.
  • the light emitting device 10 illustrated in FIG. 9A has a laminated structure in which a cathode 21 , an organic material layer 24 , and an anode 26 are laminated in this order on a substrate 23 .
  • the luminance distribution of the light emitted from the organic material layer 24 is a Lambertian distribution.
  • the light emitting device 90 illustrated in FIG. 9A has a microcavity structure in which a half mirror 92 , an anode 21 , an organic material layer 24 , and a cathode 26 are laminated in this order on the substrate 23 .
  • This microcavity structure intensifies and selects the light of a specific wavelength through the multiple reflection of the light emitted from the organic material layer 24 .
  • Such a microcavity structure has a luminance distribution in which the front direction is high and a direction other than the front direction is low.
  • the light having a small incident angle on the light emitting surface 23 a of the substrate 23 is shielded by the wide portion of the cathode 26 after being reflected at the light emitting surface 23 a .
  • the light having a large incident angle may not be shielded, after being reflected at the light emitting surface 23 a , and may leak to the rear side.
  • the light emitting device 90 illustrated in FIG. 9B adopts the microcavity structure so that the luminance of the light having a large incident angle on the light emitting surface 23 a decreases. Therefore, the light that leaks to the rear side after being reflected at the light emitting surface 23 a may be reduced.
  • the light emitting device 90 of this modified example even if the width of the anode 26 is not made as large as that of the light emitting device 10 illustrated in FIG. 9A , the light leaking to the rear side may be reduced. That is, according to the light emitting device 90 of this modified example, since an aperture ratio may be improved by decreasing the width of the anode 26 , a light emitting device with high light transmission can be implemented.
US15/623,624 2016-06-27 2017-06-15 Light emitting device Expired - Fee Related US10418591B2 (en)

Applications Claiming Priority (2)

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JP2016-126898 2016-06-27
JP2016126898A JP6758949B2 (ja) 2016-06-27 2016-06-27 発光装置

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US10418591B2 true US10418591B2 (en) 2019-09-17

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JP (1) JP6758949B2 (ja)
KR (1) KR20180001464A (ja)
CN (1) CN107546240B (ja)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US10991908B2 (en) * 2016-03-04 2021-04-27 Pioneer Corporation Light-emitting device and light-emitting system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11335890B2 (en) 2016-12-19 2022-05-17 Pioneer Corporation Light-emitting device and light-emitting system
US11320110B2 (en) 2018-05-24 2022-05-03 Koito Manufacturing Co., Ltd. Vehicle lamp
JP7174902B2 (ja) * 2018-08-10 2022-11-18 株式会社小糸製作所 車輌用灯具

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CN107546240B (zh) 2020-07-10
JP2018006382A (ja) 2018-01-11

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